Rhonda is looking at her map (shown below) trying to plan her day. She knows she definitely wants to go to the museum, but she is considering taking a detour to go to the arboretum along the way.
**How much shorter would it be for Rhonda to go straight to the museum than for her to take a detour to see the arboretum along the way?**
[[☃ input-number 1]] $\text{km}$
Round your *final answer* to the nearest tenth of a kilometer. Do not round intermediate calculations.
*Coordinate values are in kilometers.*